SYNTHESIS, CHARACTERIZATION AND MECHANICAL PROPERTIES OF POLYETHER-BASED ALIPHATIC POLYURETHANE ELASTOMERS COMPOSED OF HYPERBRANCHED POLYESTER SEGMENTS

ZHANG Jie; HU Chunpu

doi:10.3724/SP.J.1105.2009.00867

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SYNTHESIS, CHARACTERIZATION AND MECHANICAL PROPERTIES OF POLYETHER-BASED ALIPHATIC POLYURETHANE ELASTOMERS COMPOSED OF HYPERBRANCHED POLYESTER SEGMENTS

Research Article | 更新时间：2021-03-19

- SYNTHESIS, CHARACTERIZATION AND MECHANICAL PROPERTIES OF POLYETHER-BASED ALIPHATIC POLYURETHANE ELASTOMERS COMPOSED OF HYPERBRANCHED POLYESTER SEGMENTS
- Acta Polymerica Sinica Issue 9, Pages: 867-873(2009)
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- DOI：10.3724/SP.J.1105.2009.00867
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- Published：20 September 2009，
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ZHANG Jie, HU Chunpu. SYNTHESIS, CHARACTERIZATION AND MECHANICAL PROPERTIES OF POLYETHER-BASED ALIPHATIC POLYURETHANE ELASTOMERS COMPOSED OF HYPERBRANCHED POLYESTER SEGMENTS. [J]. Acta Polymerica Sinica (9):867-873(2009)
DOI：

ZHANG Jie, HU Chunpu. SYNTHESIS, CHARACTERIZATION AND MECHANICAL PROPERTIES OF POLYETHER-BASED ALIPHATIC POLYURETHANE ELASTOMERS COMPOSED OF HYPERBRANCHED POLYESTER SEGMENTS. [J]. Acta Polymerica Sinica (9):867-873(2009) DOI： 10.3724/SP.J.1105.2009.00867.

摘要

用聚四氢呋喃醚二醇、端羟基超支化聚酯（HB-20）、异佛尔酮二异氰酸酯和1，4-丁二醇，合成了含有超支化结构的聚醚型脂肪族聚氨酯（PU）弹性体.通过Flory-Rehner 公式计算了体系的交联密度；用FT-IR、WAXD和DSC表征了超支化PU的氢键化程度和形态.实验结果表明，在PU弹性体中引入少量的HB-20，能提高氨基甲酸酯羰基的氢键化程度和软硬段间的微相分离程度，从而显著提高材料的拉伸强度.由于氢键化程度和交联密度双重效应的影响，含6 wt% HB-20的聚醚型PU与不含HB-20的PU相比拉伸强度提高了2倍多，达到37.9 MPa，断裂伸长率仍高达414%.

Abstract

Aliphatic polyether-based polyurethane(PU) elastomers with hyperbranched polyester segments were synthesized by prepolymer process from polytetramethylene ether glycol

hydroxyl-terminated hyperbranched polyester (HB-20)

IPDI and 1

4-butanediol.The crosslinking density of the PU elastomer was calculated by using the Flory-Rehner equation.The degree of hydrogen bonding

the microstructure and the morphologies of these PU materials were characterized by means of FTIR

WAXD and DSC

respectively.The experimental results indicated that the PU elastomers containing small amount of HB-20 exhibited the enhanced hydrogen bonding and the micro-phase separated morphologies as well as the mechanical properties.As compared with the comparable PU specimen

the tensile strength of the polyether-based aliphatic PU containing 6 wt% HB-20 increased by 2.1 times

up to 37.9 MPa

and the elongation at break was still as high as 414%

resulting from the dual effects of the hydrogen bonding and the crosslinking density in the PU system.

关键词

超支化聚酯聚醚型脂肪族聚氨酯氢键微相分离交联密度

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